HMA3300 - 300Amp Circuit Breaker

HMA3300 - 300Amp Circuit Breaker

When you’re replacing a breaker in existing equipment, the details matter. The HMA3300 is a 300-amp, 3-pole thermal-magnetic circuit breaker designed for systems that use the HMA breaker configuration. It features an interchangeable trip unit, is rated at 40°C, and includes the load-side terminals. Interrupting ratings are 25k AIC at 600VAC, 35k AIC at 480VAC, and 65k AIC at 240VAC. Measuring 8.25"W x 16.00"L x 4.00" D, the HMA3300 gives maintenance teams, electricians, and facility personnel the specific electrical and physical characteristics they need when checking compatibility with existing equipment.

Key Features and Benefits

• 300 Amp, 3-pole configuration for compatible three-phase electrical systems
• Thermal magnetic operation provides overload and short-circuit protection
• Interchangeable trip unit for equipment designed around this HMA configuration
• Rated for 40°C
• Load-side terminals are included
• Defined dimensions make checking physical fit easier
• A practical choice for maintaining compatible existing and legacy electrical equipment
  

Technical Specifications

• Part Number: HMA3300
  
• Type: HMA
  
• Breaker Type: Thermal Magnetic
  
• Amperage: 300 Amps
  
• Poles: 3
  
• Temperature Rating: 40°C
  
• Trip Unit: Interchangeable
  
• A.I.C. @ 600VAC: 25k
  
• A.I.C. @ 480VAC: 35k
  
• A.I.C. @ 240VAC: 65k
  
• Width: 8.25 in.
  
• Height / Length: 16.00 in.
  
• Depth: 4.00 in.
  
• Dimensions: 8.25"W x 16.00"L x 4.00"D
  
• Approx. Shipping Weight: 46.00 lbs.
  
• Terminals: Load-side terminals included
  

Material Compliance and Certifications

Material compliance and certification details were not provided in the available specifications for the HMA3300, so no particular UL, CSA, RoHS, or other certification should be assumed.

If your installation has specific listing or compliance requirements, check the markings on the breaker and the documentation for the equipment in which it will be installed.

Where It Works Best

The HMA3300 circuit breaker makes the most sense for existing electrical distribution equipment designed to accept an HMA 300-Amp, 3-pole thermal-magnetic breaker. This can include legacy electrical systems where maintaining the original breaker configuration and physical fit is important.